Led Zeppelin were the biggest band in the world at one point. Millions of spins of “Stairway to Heaven” earned them a posthumous reputation as the biggest dinosaurs, however. Well, the songs may remain the same, but this sprawling three-CD document of the band’s 1972 dates at the LA Forum and Long Beach Arena reanimates this Tyrannosaurus Rex. 2 ½ hours (including an almost half-hour-long “Dazed and Confused!”) of their very best early hits sped up, expanded, and enlarged to arena proportions – it makes the greatest songs in classic rock history feel fresh again.